Studentmanagement.java

// TASK 3 - STUDENT MANAGEMENT SYSTEM
import java.util.ArrayList;
import java.util.Scanner;

class Student {
    private String name;
    private int rollNumber;
    private String grade;

    public Student(String name, int rollNumber, String grade) {
        this.name = name;
        this.rollNumber = rollNumber;
        this.grade = grade;
    }

    public String getName() {
        return name;
    }

    public int getRollNumber() {
        return rollNumber;
    }

    public String getGrade() {
        return grade;
    }
}

class StudentManagementSystem {
    private ArrayList<Student> students;

    public StudentManagementSystem() {
        students = new ArrayList<>();
    }

    public void addStudent(Student student) {
        students.add(student);
        System.out.println("Student added successfully.");
    }

    public void removeStudent(int rollNumber) {
        students.removeIf(student -> student.getRollNumber() == rollNumber);
        System.out.println("Student removed successfully.");
    }

    public Student searchStudent(int rollNumber) {
        for (Student student : students) {
            if (student.getRollNumber() == rollNumber) {
                return student;
            }
        }
        return null;
    }

    public void displayAllStudents() {
        for (Student student : students) {
            System.out.println("Name: " + student.getName() + ", Roll Number: " + student.getRollNumber() + ", Grade: " + student.getGrade());
        }
    }
}

public class Studentmanagement{
    public static void main(String[] args) {
        StudentManagementSystem sms = new StudentManagementSystem();
        Scanner sc = new Scanner(System.in);

        while (true) {
            System.out.println("1. Add Student\n2. Remove Student\n3. Search Student\n4. Display All Students\n5. Exit");
            int choice = sc.nextInt();

            switch (choice) {
                case 1:
                    System.out.print("Enter name: ");
                    String name = sc.next();

                    System.out.print("Enter roll number: ");
                    int rollNumber = sc.nextInt();

                    System.out.print("Enter grade: ");
                    String grade = sc.next();
                    if (name.isEmpty() || grade.isEmpty()) {
                        System.out.println("Name and grade cannot be empty. Please try again.");
                        continue;
                    }

                    sms.addStudent(new Student(name, rollNumber, grade));
                    break;

                case 2:
                    System.out.print("Enter roll number to remove: ");
                    int removeRollNumber = sc.nextInt();
                    sms.removeStudent(removeRollNumber);
                    break;

                case 3:
                    System.out.print("Enter roll number to search: ");
                    int searchRollNumber = sc.nextInt();
                    Student searchedStudent = sms.searchStudent(searchRollNumber);
                    if (searchedStudent != null) {
                        System.out.println("Student found: " + searchedStudent.getName());
                    } else {
                        System.out.println("Student not found.");
                    }
                    break;

                case 4:
                    sms.displayAllStudents();
                    break;

                case 5:
                    System.out.println("Exiting application.");
                    System.exit(0);

                default:
                    System.out.println("Invalid choice. Please try again.");
            }
        }
    }
}